Rotary Drum Thread Supply Device with Optical Sensor Control
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Solution Overview
Problem
Existing thread supply systems for textile machines often introduce torsions in the thread due to speed differences between the drum and the machine, leading to potential defects and weakening of the thread, especially in thin threads.
Innovation Solution
A universal thread supply device with a rotary drum and optical sensor system that maintains a constant thread reserve by synchronizing the loading and pickup speeds to match the textile machine's requirements, eliminating torsions and ensuring reliable operation regardless of thread direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a rotary drum supplier is used to accumulate thread reserve, then the thread supply continuity is improved, but torsions are created on the thread due to speed difference between drum and machine
Solution Approach 1:
The patent introduces a guide member that acts as an intermediary between the rotary drum and the textile machine. This guide member redirects the thread path so that when the drum rotates to supply thread, the thread does not undergo twisting motions. The guide member effectively decouples the rotational motion of the drum from the linear thread feeding motion required by the machine, thereby eliminating torsion while maintaining continuous supply.
2Speed
If the drum rotation speed is increased to match machine pickup speed, then thread supply synchronization is improved, but the ability to maintain thread reserve control is worsened
Solution Approach 1:
The patent employs dynamic control of the drum rotation speed through a control unit that continuously monitors the thread reserve amount. The drum speed is dynamically adjusted to maintain the thread reserve within optimal boundaries - rotating faster when reserve is low and slower when reserve is high. This dynamic adjustment ensures both synchronization with machine pickup and reliable control of thread reserve, resolving the contradiction between speed matching and reserve control.
3Device complexity
If a fixed drum supplier is used, then device complexity is reduced, but thread torsion cannot be eliminated due to speed difference
Solution Approach 1:
The patent adds a guide member as a relatively simple intermediary component to the fixed drum supplier. This guide member redirects the thread path to prevent twisting during supply. By introducing this single structural element, the system eliminates thread torsion without significantly increasing overall device complexity, making the solution practical for implementation in existing textile machines.
Data Source
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Figure 3
AI summary
A method for supplying a thread (F) to a textile machine (100) without creating torsions thereof comprises picking up the thread (F) from a reel, winding it on a rotary drum (5) driven by an electric motor (6) thereof and supplying such thread (F) to the textile machine, preferably at constant tension and/or quantity. There is provided for measuring the amount of thread (F) leaving the rotary drum (5) and the amount of thread wound thereon and intervene on the rotation of such drum so that the amount of thread leaving the drum is equivalent to the one that is loaded thereon so as to avoid the creation of torsion on the thread. The device for implementing such method is also claimed herein.